Unless you're a mage, you can't really contribute to even the lowest level Abyssea parties (worms and frogs in La Thiene or Raptors/birds in Mis). The only thing you could do is key whore and open chests, but if you haven't done any Abyssea you can't do that since you won't have cruor to buy keys with. Keep doing pages until level 70-75 (try Crawler's Nest, dunno what server you're on but there's always people there on mine). After that go ahead and try to get into an abyssea shout. Let people know it's your first Abyssea and it might take you some time to get to camp, or better yet ask for a guide.
Take whatever job you'll enjoy. If you want to do mostly Abyssea stuff for a while, level up nin, dnc, take one of those to 99 and use the other as a sub, solo everything.
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